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Carbon brush, also known as brush, as a sliding contact, in many electrical equipment has been widely used. Carbon materials in the application of products are mainly graphite, graphite impregnated graphite, metal (including copper, silver) graphite. The carbon brush is the energy transfer device or signal between motor or generator or other rotating machinery of the fixed part and the rotating part, it is generally made of pure carbon coagulant, the general shape is square, stuck in the metal bracket, which has spring pressed it on the shaft, when the rotation of the motor, the power through the change which is delivered to the coil, as its main components are carbon, known as carbon brush, it is easy to wear.…
The electrode material is one of the key materials for vanadium redox flow battery. Due to the large surface area and good stability, the graphite felt is dominant. However, the graphite felt material has poor hydrophilicity, and its electrochemical activity is not good enough. This paper on the graphite felt electrode respectively chromic acid oxidation method, mixed acid electrochemical oxidation method and hydrothermal ammoniation method for processing vanadium redox flow battery to improve its activity, the main conclusions are as follows: after chromic acid oxidation, hydrophilicity and electrochemical activity of the Shi Mozhan electrode increased, the optimum processing time is 5 h. In the 10 to 70mA/cm2, the battery with the graphite felt after the treatment with the chromate has…
C/SiC composite material is a kind of composite material which is made of SiC fiber as the reinforcing material in the SiC ceramic matrix, and the SiC reinforced fiber is introduced as the dispersed phase and the SiC ceramic matrix as the continuous phase. C/SiC composite material retains the advantages of SiC ceramic high temperature resistance, high strength, oxidation resistance, corrosion resistance, impact resistance, while both SiC fiber reinforced and toughening effect, overcomes the congenital defects of low toughness and resistance to external impact load and poor performance of SiC ceramic fracture. This material can be maintained at a temperature of 1316 C in the absence of physical and chemical properties of its degradation. When the SiC/SiC material sprayed with…
